GC9057 Silane
CH2=CHSi(OCH3)3
Introduction
GC9057silane,vinyltrimethoxysilane, is used as a polymer
Modifier via grafting reactions.the resulting pendant
Trimethoxysilyl groups can function as moistire-activated crosslinking sites.the silane grafted polymer is processed as a
Thermoplastic and crosslinking occurs after
Fabrication of the finished article upon exposure to moisture.
Typical Physical Properties
Chemical Name Vinyltrimethoxysilane
Color and Appearance Colorless transparent liquid
Density(ρ20)g/cm3 0.9700±0.0005
Refractive Index 1.3930±0.0005
Boiling Point 123[760mmHg]
Min.Purity by GC 98.0%
Cas no. 2768-02-7
EINECS NO. 220-449-8
Applications
GC9057 is used to modify polyethylene and other polymers by grafting its vinyl
Group to the polymer backbone using a radical initiator,such as peroxide.this provide
A polymer with pendant trimethoxysilyl groups that ma be used as mositure-activated
Crosslinking sites vis hydrolysis of the alkoxy groups followed by condensation of
The resulting silanols.
- Crossing of silane-grafted polymers.
The reaction of silane-grafted polyethylene to form a crosslinked or vulcanized
Polyethlene used water to form the crosslinks.this technology is widely used around
The world for commerical application in wire and cable insulation,tubing ,and other
Similar uses.
The basic reaction sequence is as follows;polyethylene is reacted (grafted)with
Vinyltrimethoxysilane,using a peroxide initiator,in an extruder.the grafted
Polyethylene is then formed into a finished product,such as cable jacketing,wire
Insulation,or pipe.the forming step is usually done by a second extrusion,during which
A catalyst for the mositure-cure step is added.finally,the formed article is exposed to
Moisture or hot water to cause hydrolysis of the silane and condensation to form
Crosslinks via Si-O-Si bond formation.
Benefits of crosslinking
- Higher maximum use temperature
- Reduce deformation under load (creep)
- Improved chemical resistance
- Superior environmental stress crack resistance
- Increased abrasion resistance
- Improved impact strength
- Memory characteristics(shrink film,tubing)
- Improved impact strength
Advantages of silane crosslinking over radiation or peroxide crosslinking
- Low capital investment
- Low operating(energy)costs
- Higher productivity
- Processing versatility
- Thick,thin,or variable thinknesses possible
- Complex shaps possible
- Wilder processing latitude (control of premature crosslinking)
- Useful with filled composites
- Applicable to all polyethylene densities and copolymers
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